Accept 2 Strings and display common chars in them [closed]

Answer 1

You can try something like this using HashSet

import java.util.HashSet;
import java.util.Set;

public class QuickTester {

    public static void main(String[] args) {

        String s1 = "happy";
        String s2 = "elephant";

        Set set1 = new HashSet();
        Set set2 = new HashSet();

        for(char c : s1.toCharArray()) {
            set1.add(c);
        }
        for(char c : s2.toCharArray()) {
            set2.add(c);
        }

        // Stores the intersection of set1 and set2 inside set1
        set1.retainAll(set2);

        for(char c : set1) {
            System.out.print(" " + c);
        }

        System.out.println("\nTotal number of common characters: "
            + set1.size());
    }
}

Refer to retainAll on how the intersection of 2 sets is done.

Input Strings:

happy
elephant

Output:

 p a h
Total number of common characters: 3